<template>
  <div class="login" :style="'background-image:url('+ Background +');'">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      label-position="left"
      label-width="0px"
      class="login-form"
    >
      <h3 class="title">
        与你基金后台管理系统
      </h3>
      <el-form-item prop="username">
        <el-input v-model="loginForm.username" type="text" auto-complete="off" placeholder="账号">
          <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon" />
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input
          v-model="loginForm.password"
          type="password"
          auto-complete="off"
          placeholder="密码"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon" />
        </el-input>
      </el-form-item>
      <el-form-item prop="code">
        <el-input
          v-model="loginForm.code"
          auto-complete="off"
          placeholder="验证码"
          style="width: 63%"
          @keyup.enter.native="handleLogin"
        >
          <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon" />
        </el-input>
        <div class="login-code">
          <img :src="codeUrl" @click="getCode">
        </div>
      </el-form-item>
      <el-checkbox v-model="loginForm.rememberMe" style="margin: 0 0 25px 0">
        记住我
      </el-checkbox>
      <el-form-item style="width: 100%">
        <el-button
          :loading="loading"
          size="medium"
          type="primary"
          style="width: 100%"
          @click.native.prevent="handleLogin"
        >
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
      </el-form-item>
    </el-form>
    <!-- 底部 -->
    <div v-if="$store.state.settings.showFooter" id="el-login-footer">
      <span v-html="$store.state.settings.footerTxt" />
      <span> . </span>
      <a href="https://beian.miit.gov.cn/#/Integrated/index" target="_blank">{{ $store.state.settings.caseNumber }}</a>
    </div>
  </div>
</template>

<script>
import { encrypt } from '@/utils/rsaEncrypt'
import Config from '@/settings'
import Code from '@/assets/images/code.png'
import { getCodeImg } from '@/api/login'
import Cookies from 'js-cookie'
// 导入网页背景图片
import Background from '@/assets/images/user/background.jpg'

export default {
  name: 'Login',
  data() {
    return {
      // 登录页背景图片
      Background: Background,

      // 登录表单数据
      loginForm: {
        // 用户名
        username: 'admin',
        // 密码
        password: '123456',
        // 验证码
        code: '',
        // 记住我
        rememberMe: false,
        // uuid
        uuid: ''
      },
      // 验证码图片链接
      codeUrl: Code,
      // 登录按钮loading状态
      loading: false,
      // 登录表单验证对象
      loginRules: {
        username: [{ required: true, message: '用户名不能为空', trigger: 'blur' }],
        password: [{ required: true, message: '密码不能为空', trigger: 'blur' }],
        code: [{ required: true, message: '验证码不能为空', trigger: 'change' }] // change数据改变时校验
      },
      redirect: undefined,
      // cookie中的加密密码
      cookiePass: ''
    }
  },
  // immediate: true 说明加载登录页面时就会执行handler函数，handler的第一个参数表示to,
  // 加载登录页后，直接获取，登录页地址栏的的redirect参数，赋值给this.redirect
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  created() {
    // 获取验证码
    this.getCode()
    // 获取用户名密码等cookie
    this.getCookie()
    // token过期提示
    this.point()
  },
  methods: {
    // 点击验证码图片，获取验证码
    getCode() {
      getCodeImg().then(res => {
        this.codeUrl = res.img
        this.loginForm.uuid = res.uuid
      })
    },
    // 获取用户名密码等cookie
    getCookie() {
      const username = Cookies.get('username')
      let password = Cookies.get('password')
      const rememberMe = Cookies.get('rememberMe')
      // 保存cookie里面的加密后的密码
      this.cookiePass = password === undefined ? '' : password
      password = password === undefined ? this.loginForm.password : password
      this.loginForm = {
        username: username === undefined ? this.loginForm.username : username,
        password: password,
        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe),
        code: ''
      }
    },
    // 处理登录事件
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        const user = {
          username: this.loginForm.username,
          password: this.loginForm.password,
          rememberMe: this.loginForm.rememberMe,
          code: this.loginForm.code,
          uuid: this.loginForm.uuid
        }
        if (user.password !== this.cookiePass) {
          user.password = encrypt(user.password)
        }
        if (valid) {
          this.loading = true
          if (user.rememberMe) {
            Cookies.set('username', user.username, { expires: Config.passCookieExpires })
            Cookies.set('password', user.password, { expires: Config.passCookieExpires })
            Cookies.set('rememberMe', user.rememberMe, { expires: Config.passCookieExpires })
          } else {
            Cookies.remove('username')
            Cookies.remove('password')
            Cookies.remove('rememberMe')
          }
          // 调用Vuex Action：Login
          this.$store.dispatch('Login', user).then(() => {
            this.loading = false
            this.$router.push({ path: this.redirect || '/' })
          }).catch(() => {
            this.loading = false
            this.getCode()
          })
        } else {
          console.log('提交错误！')
          return false
        }
      })
    },
    // token过期提示
    point() {
      const point = Cookies.get('point') !== undefined
      if (point) {
        this.$notify({
          title: '提示',
          message: '当前登录状态已过期，请重新登录',
          type: 'warning',
          duration: 5000
        })
        Cookies.remove('point')
      }
    }
  }
}
</script>

<style type="stylesheet/scss" lang="scss">
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-size: cover;
}

.title {
  margin: 0 auto 30px auto;
  text-align: center;
  color: #666666;
}

.login-form {
  border-radius: 6px;
  background: #ffffff;
  width: 385px;
  padding: 25px 25px 5px 25px;

  .el-input {
    height: 38px;

    input {
      height: 38px;
    }
  }

  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 2px;
  }
}

.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}

.login-code {
  width: 33%;
  display: inline-block;
  height: 38px;
  float: right;

  img {
    cursor: pointer;
    vertical-align: middle;
  }
}
</style>
